package com.zhu.filter;



import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 *
 */
public class LoginFilter implements Filter {
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;

        Object attribute = req.getSession().getAttribute("loginUser");
        if(attribute==null){
            req.setAttribute("msg","请登录");
            req.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(req,resp);
        }else {
            filterChain.doFilter(req,resp);
        }
    }

    public void destroy() {

    }
}
